OLD FAITHFUL, WYOMING

Monthly Average Maximum Temperature (Degrees Fahrenheit)

(486845)

File last updated on Jul 25, 2006
*** Note *** Provisional Data *** After Year/Month 200603
a = 1 day missing, b = 2 days missing, c = 3 days, ..etc..,
z = 26 or more days missing, A = Accumulations present
Long-term means based on columns; thus, the monthly row may not
sum (or average) to the long-term annual value.
MAXIMUM ALLOWABLE NUMBER OF MISSING DAYS : 5
Individual Months not used for annual or monthly statistics if more than 5 days are missing.
Individual Years not used for annual statistics if any month in that year has more than 5 days missing.
YEAR(S) JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANN
1978 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 61.75 f 54.63 a 34.20 18.23 35.69
1979 17.94 29.57 38.81 42.73 55.00 65.67 75.27 a 69.68 69.27 52.58 33.23 33.10 48.57
1980 25.71 34.93 33.10 49.23 53.50 a 63.34 a 73.06 67.27 a 60.45 a 49.89 c 36.33 32.90 48.31
1981 35.32 32.07 41.68 47.19 c 51.13 h 59.79 a ----- z 76.87 67.10 48.43 c 39.41 a 28.00 47.59
1982 22.17 a 25.54 34.67 a 40.80 j ----- z 63.00 69.36 c 73.44 d 59.56 n 44.39 c 30.23 25.07 b 43.10
1983 30.81 33.32 37.16 ----- z 52.27 e 61.00 70.71 74.13 a 61.63 ----- z ----- z ----- z 52.63
1984 ----- z ----- z 37.26 46.50 l 52.97 60.00 j 76.68 76.29 ----- z ----- z 33.17 22.94 49.88
1985 ----- z 22.37 a 34.48 47.23 58.52 65.65 d 75.55 69.10 53.04 g 47.65 26.27 25.97 47.28
1986 31.97 31.00 42.90 45.53 54.26 70.18 b 69.03 74.06 55.96 b 51.52 33.50 30.74 49.22
1987 27.23 36.39 38.97 55.47 59.77 67.52 a 70.65 69.84 68.90 58.32 43.40 31.13 52.30
1988 29.97 41.17 44.10 48.63 58.16 74.63 79.57 a 75.90 63.53 59.97 32.87 28.06 53.05
1989 29.23 30.43 44.58 46.10 a 54.55 63.67 78.94 70.32 64.37 50.13 39.90 27.00 49.93
1990 27.65 28.21 41.45 50.53 51.23 64.53 75.32 74.39 70.93 46.90 36.77 17.94 48.82
1991 25.68 41.29 39.29 44.97 53.32 65.50 75.10 76.77 64.30 50.84 33.03 28.06 49.85
1992 30.61 41.66 49.48 52.47 62.39 66.03 67.77 74.35 61.00 53.71 30.70 22.61 51.07
1993 28.23 32.82 44.81 45.63 59.97 60.73 64.13 70.45 64.03 49.43 a 31.60 27.45 48.27
1994 31.23 30.89 46.94 50.53 61.65 67.77 77.48 79.74 71.27 47.58 29.77 29.61 52.04
1995 29.19 39.21 39.65 46.37 53.19 63.17 72.77 75.23 66.07 46.77 37.60 30.10 49.94
1996 26.94 31.83 36.06 43.53 48.71 69.60 76.19 74.23 58.27 ----- z 37.57 25.74 48.06
1997 26.81 30.29 36.48 40.47 55.77 66.47 72.10 72.74 64.33 48.00 37.63 26.57 a 48.14
1998 30.97 32.86 36.81 46.33 56.55 57.80 77.97 75.65 69.30 52.10 34.77 26.47 a 49.80
1999 28.68 31.36 41.48 43.73 52.55 63.93 75.87 77.06 62.77 55.77 44.90 28.81 50.58
2000 27.71 35.24 37.90 48.53 53.39 64.97 76.19 75.84 60.90 49.26 28.47 26.87 48.77
2001 30.39 27.11 39.52 42.87 58.35 64.53 75.84 ----- z 67.97 ----- z 40.73 25.19 47.25
2002 23.32 28.32 30.74 43.63 53.52 65.10 79.10 70.84 63.23 44.77 33.17 29.19 47.08
2003 32.58 29.04 35.06 45.07 ----- z ----- z 80.52 77.19 62.10 55.13 27.77 28.87 47.33
2004 27.13 28.52 40.35 48.73 51.52 63.17 72.68 69.61 59.80 49.30 d 37.97 28.65 48.12
2005 29.35 32.96 37.45 43.97 ----- z 60.33 75.42 72.42 60.67 51.90 35.40 25.45 47.76
2006 26.81 26.07 34.63 a 46.47 57.70 a 68.11 b 76.53 l ----- z ----- z ----- z ----- z ----- z 43.30
Period of Record Statistics
MEAN 28.21 32.02 39.14 46.64 55.37 64.85 74.36 73.59 64.09 50.79 34.83 27.06 49.66
S.D. 3.53 4.86 4.33 3.36 3.52 3.58 3.97 3.14 4.06 3.98 4.60 3.64 1.63
SKEW -0.81 0.44 0.42 0.65 0.35 0.50 -0.70 -0.21 0.12 0.55 0.24 -0.83 0.60
MAX 35.32 41.66 49.48 55.47 62.39 74.63 80.52 79.74 71.27 59.97 44.90 33.10 53.05
MIN 17.94 22.37 30.74 40.47 48.71 57.80 64.13 67.27 55.96 44.39 26.27 17.94 47.08
NO YRS 26 27 28 25 24 26 26 26 24 24 27 27 18